Padlock



W. S. HAMM.

PADLOCK.

APPLICATION FILED DEC-23,1919.

Patented Mar. 30, 1920.

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NirEn STATES P TENT onnion.

WILLIAM S. HAMM, OF HUBBARD WOODS, ILLINOIS,.ASSIGNOR TO THE ADAMS & WESTLAKE (30., A CORPORATION OF ILLINOIS.

PADLOGK.

Specification of Letters Patent.

Patented Mar. 30, 1920.

Application filed December 23, 1919. Serial No. 346,879.

To all whom it may concern:

Be it known that I, WILLIAM S. HAMM, a citizen of the United States, and resident of Hubbard Woods, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Padlocks, of which the following is a specification, and which are illustrated. in the accompanying drawings, forming a part thereof.

The invention relates to padlocks primarily intended for use on railway switch stands. The objects of the invention are to simplify and generally improve upon the construction of locks of this type, rendering the look more diflicult to open by plcking or concussion. A further object of the invention is to insure a complete automatic locking action by the closing of the shackle. An embodiment of the invention is fully hereinafter described and illustrated in the accompanying drawings in which- Figure 1 is a view of the lock in closed position with one of the side faces of the casing removed, the position of the shackle when open being indicated by dotted lines;

Fig. 2 is a similar view, the lock being in process of opening;

Fig. 3 is a sectional view on the line 3-3 of Fig. 1'; I

Fig. 4 is a detail and perspective of one of the tumblers of the lock, and

Fig. 5 is a view in perspective of the key for use in connection with the lock.

The casing of the lock is of the usual, substantial form, having side walls 10, 11, which are provided with instanding complementary marginal flanges 12, 13. The two members of the casing are secured together by the usual bolts or rivets, some of which may also serve as pivots for the tumblers and anchorage for the springs. The casing is provided with the usual apertures to accommodate the two ends of the bowed shackle 14, one end of which is pivotally attached to the casing as indicated at 15, its other end or nose 16 being adapted to project into the casing and being provided with an aperture 17 for receiving a tumbler 18.

Two tumblers 18, 19, are employed and pivotally secured within the casing, as at 20, 21, upon opposite sides of the key post 22. Both of these tumblers are substantially in bell crank form. One arm of the tumbler 18 is in an engaging position with the aperture 17 of the nose of the shackle and is given the general configuration of a hook having a nose 23 for entering such aperture. The other arm 24 of the tumbler 18 projects-over the key post 22.

One arm 26 of the tumbler 19 cooperates with a lug 25 projecting inwardly from the hub of the shackle'14, projecting into the path which this lug must follow as the shackle swings outwardly. The other arm 27 of the tumbler 19 extends over the key post lying alongside of the arm 24 of the tumbler 18. A spring, preferably of wire, is wound about a post 28 within the casing, one of its end portions 29 bearing upon the arm 24 ofthe tumbler 18 to urge the hook 23 thereof into engagement with the aperture 17, the other end 30 of this spring bearing upon the end of the tumbler arm 27 and urging the end of its arm 26 into engagement with the lug 24. A spring 31, as shown as anchored upon the post 28, eXtendsacross the path of the nose of the shackle as it enters the casing and causes the initial opening movement of the shackle when the latter is released by the tumblers. A detent in the form of a lug or stud 32, carried by one of the tumblers, interlocks with the other when the tumblers occupy their normal position under the influence of the springs 29, 30. Preferably, as shown, this stud or detent is set in the arm 27 of the tumbler 19 and engages back of a shoulder 33 formed on the arm 24 of the tumbler 18.

The key 34 is socketed to fit upon the key post 22, and is provided with wards 35, 36,

for engaging, respectively, the tumbler arms 27, 24. The extreme end of the tumbler arm 27 is in position to be first engaged by the key. The raising of this arm disengages the stud 32 from the shoulder 33 and permits the tumbler arm 24 to be then raised by the action of the key. The movements of the tumbler by the action of the key are indicated in Fig. 2 of the drawings. The tumblers being rocked on their pivots to disengage both the heel and the toe of the shackle, the latter is thrown open by the action of the spring 31. As the movement of the key is continued to disengage it from the tumblers, they are immediately returned to their normal position, as shown in Fig. 1, by the action of the springs 29, 30. When in this position the lug 25 is forward of the tumbler arm 26, as indicated by dotted lines in Fig. 1, and hence, as the shackle is moved to closing position it forces this arm backwardly until it passes over the end of the arm, again permitting the tumbler to assume its normal position, the end of its arm 26 engaging the under or front side of the lug 25 and locking the shackle against outward movement. As the nose of the shackle enters-the casing it cams the tumbler 1'8 backwardly until its hook 23 registers with the aperture 17, the tumbler springs back into normal position, the hook engaging this aperture and forming a second lockfor the shackle.

This lock can be picked only by an instru- --ment which will first raise the tumbler arm 27 to disengage the stud 32 from the shoulder 83, and while holding it in this position will raise the tumbler arm 24. The lock cannot be opened by blows upon its casing for the reason that any blow tending to swing the tumbler 19 upon its pivot would urge the hook 27 into the aperture 17. A blow tending to swing the tumbler 18 backwardly would be resisted by the stud 32,

which would be urged downwardly by the each tumbler extending into the path of a key turning upon the post, such last named arms being interlocked to prevent simultaneous movement when the tumblers are engaged with the shackle.

2. In a padlock, in combination, an oscillatable shackle having an inwardly projecting lug at its heel end and an aperture in its free end, a key post, a pair of tumblers inbell-crank form pivoted at opposite sides of the shoulderwhen the tumblers are enshackle is open, another arm of said tumbler projecting over the post and having a lateral stud, a second tumbler pivoted at the side of the post, opposite from that atwhich the first named tumbler is pivoted, the second named tumbler having a hook engageable with-the shoulder of the shackle and an arm projecting over thepost .andlprovided with a shoulder engageable with the vstud of the first named tumbler, and means for normally holding'both tumblers in advanced positions.

4. In a padlock, in combination, a casing, a shackle pivoted in said casing and having aportion vat each end-adapted to project into the casing, a plurality of bell-crank levers pivoted in the casing, certain of said levers having one. arm adapted to. engage with one oi said inwardly pro ecting portions and .certainof the remaining-levershaving one arm adapted to engage with the other'of said inwardly projecting portions, means interlocking the remaining arms whereby simultaneous initiation of movement thereof is prevented.

WVILLIA M S. HAMM. 

